Retired U.S. Army Lt. Col. David Grossman presents his Bulletproof Mind lecture to approximately 150 Nellis Airmen Aug. 18, 2011, in the base theater at Nellis Air Force Base, Nev. Grossman, author of "On Killing" and "On Combat," spoke to the Airmen about how external sources can negatively affect the minds of military personnel and what military personnel can do to "bulletproof" their minds against such adversaries. (U.S. Air Force photo by Senior Airman Stephanie Rubi/Released)
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